Make IrodsPath usable with open() function

[qubixes]

I think it would be really nice with we could do:

with open(ipath, "w") as handle:
     handle.write("...")

And read as well of course. I don't know how much would be involved with this, but it could stimulate our users to not download files. The feature is already present in the python-irodsclient I think, but it would be nice if this could be directly exposed through the irods path. Given that it's already implemented upstream, perhaps it would not be too much work.

Edit:

After looking at this for a bit, the easier solution would be to use a similar system as PRC, so ipath.open(...).